NEET Biology question
Given below are four statements (i-iv) regarding human blood circulatory system (i) Arteries are thick-walled and have narrow lumen as compared to veins (ii) Angina is acute chest pain when the blood circulation to the brain is reduced (iii) Persons with blood group AB can donate blood to any person with any blood group under ABO system (iv) Calcium ions play a very important role in blood clotting Which two of the above statements are correct?
Solution
Statement (i) is correct since arteries are thick-walled with a comparatively narrow lumen, and statement (iv) is correct since calcium ions (factor IV) are essential to the clotting cascade; statement (ii) is wrong because
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